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Linux/arch/sh/kernel/cpu/sh3/clock-sh7706.c

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  1 /*
  2  * arch/sh/kernel/cpu/sh3/clock-sh7706.c
  3  *
  4  * SH7706 support for the clock framework
  5  *
  6  *  Copyright (C) 2006  Takashi YOSHII
  7  *
  8  * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
  9  *  Copyright (C) 2005  Andriy Skulysh
 10  *
 11  * This file is subject to the terms and conditions of the GNU General Public
 12  * License.  See the file "COPYING" in the main directory of this archive
 13  * for more details.
 14  */
 15 #include <linux/init.h>
 16 #include <linux/kernel.h>
 17 #include <asm/clock.h>
 18 #include <asm/freq.h>
 19 #include <asm/io.h>
 20 
 21 static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
 22 static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
 23 static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
 24 
 25 static void master_clk_init(struct clk *clk)
 26 {
 27         int frqcr = __raw_readw(FRQCR);
 28         int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
 29 
 30         clk->rate *= pfc_divisors[idx];
 31 }
 32 
 33 static struct sh_clk_ops sh7706_master_clk_ops = {
 34         .init           = master_clk_init,
 35 };
 36 
 37 static unsigned long module_clk_recalc(struct clk *clk)
 38 {
 39         int frqcr = __raw_readw(FRQCR);
 40         int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
 41 
 42         return clk->parent->rate / pfc_divisors[idx];
 43 }
 44 
 45 static struct sh_clk_ops sh7706_module_clk_ops = {
 46         .recalc         = module_clk_recalc,
 47 };
 48 
 49 static unsigned long bus_clk_recalc(struct clk *clk)
 50 {
 51         int frqcr = __raw_readw(FRQCR);
 52         int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
 53 
 54         return clk->parent->rate / stc_multipliers[idx];
 55 }
 56 
 57 static struct sh_clk_ops sh7706_bus_clk_ops = {
 58         .recalc         = bus_clk_recalc,
 59 };
 60 
 61 static unsigned long cpu_clk_recalc(struct clk *clk)
 62 {
 63         int frqcr = __raw_readw(FRQCR);
 64         int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
 65 
 66         return clk->parent->rate / ifc_divisors[idx];
 67 }
 68 
 69 static struct sh_clk_ops sh7706_cpu_clk_ops = {
 70         .recalc         = cpu_clk_recalc,
 71 };
 72 
 73 static struct sh_clk_ops *sh7706_clk_ops[] = {
 74         &sh7706_master_clk_ops,
 75         &sh7706_module_clk_ops,
 76         &sh7706_bus_clk_ops,
 77         &sh7706_cpu_clk_ops,
 78 };
 79 
 80 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
 81 {
 82         if (idx < ARRAY_SIZE(sh7706_clk_ops))
 83                 *ops = sh7706_clk_ops[idx];
 84 }
 85 

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